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Greylisting - Email Delivery Delays
Messages to TOAST.net receive error "554 Sorry, message looks like SPAM to me."
Non-Deliverable Error Messages
PTR - Due to Mis-configured DNS Settings
Real Time Blacklist
Receiving bounced/undeliverable messages from an email you haven't sent
Requirements For Message Delivery To TOAST.net
SPF Rules - Email returned stating "Does not pass SPF requirements for domain"
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